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[Web Creator] [LMSOFT]
VT Commodore Differential Issues
Phoenix Mechanical
Soaring

LSD Chatter - The original oil and friction modifying additive used in VT and early VX commodores with LSD, can in some cases be ineffective in adequately lubricating the LSD unit, depending on operating temperatures. GMH, in conjunction with SAA (Spicer Axle Australia, formerly BTRE), have revised the oil and additive used to help improve lubricating qualities.

GMH use Mobilube SHC ID (1.5ltrs) in LSD units along with the revised friction modifier (100ml). They suggest no other alternative! The new oil and modifier requires the existing Viton material pinion seal to be replaced with a new Polyacrylic material pinion seal.

Additive Kit - Part number 92145121

Differential trouble - Excessive backlash, noisy differentials, sticking L.S.D.'s are the main issues with VT diffs. In many cases, backlash has been excessive, and has lead to the differential unit being replaced. GMH is now using a alternative additive to try and overcome temperature problems. BTR engineering (who were the previous suppliers of diffs to GMH) were taken over by Dana. Apparently Dana use different materials in their differentials, which expand and contract at different temperatures causing some problems.

Tyre wear - Excessive rear inside tyre wear is common on VT's. Rear camber kits are available to correct wheel angle and reduce tyre wear. Holden recommends only using a 2 way adjustable rear camber kit instead of a 4 way (Adjustable outers with standard inners), because of issues regarding higher speed stability.

Wagon Driveline vibration - During takeoff, or around 70-80k's, some automatic V6 wagons vibrate through the driveline, which may be caused by an incorrect tail shaft angle. 2 3mm spacers (92138057) are used to raise the centre mount of the tail shaft to help reduce vibrations